March 21, 1935 (advertisement); August 3, 2013 (Digital Image)
Source
(Original text : "The Program - Metropolitan Opera House" Thirteenth Week, March 18-24, 1935 Published by The Tribune Publishing Co.
"The Cooper Collections " (uploader's private collection)
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
{{Information | Description=1935 advertisement for [[Wm. Knabe & Co.]] pianos as the "Official Piano of the [[Metropolitan Opera]]'' | Source="The Program - Metropolitan Opera House" Thirteenth Week, March 18-24, 1935 Published by The Tribune Publishi...
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